indicators

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Indicator
 Colour in strong acid
 Colour in weak acid
 Colour
neutral
 Colour in weak alkali
 Colour in strong alkali
pH
 1-3
 4-6
 7
 8-10
 11-14
universal
 red
 orange/yellow
 green
 blue
 purple
methyl orange
 red

yellow
 yellow
phenolphthalein
 colourless
 colourless

pink
litmus
 red
 red
blue
 blue